Cass County, Illinois

Cass County, Illinois, has 12,463 residents (July 2025 estimate). Its county seat is Virginia. It uses Central Time and covers 376 sq mi (973 km²) of land.

Cass County in Illinois

Cass County and its neighbors (simplified outlines). Open in OpenStreetMap ↗

Resident population, July 2025: 12,463
Land area: 376 sq mi (973 km²)
County seat or government: Virginia
Time zone: Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income: $68,125 ± $4,852
Median home value: $97,100 ± $4,542
Median rent, with utilities: $723 ± $88
Homes lived in by their owners: 75.9% ± 2.7 points
County type: County
Metro or micro area: Outside any metro or micro areaNext to: Jacksonville, IL micro area and Springfield, IL metro area
Water area: 7.94 sq mi (20.6 km²)
State: Illinois
County code (FIPS): 17017
Coordinates (central point): 39.969202, -90.245704

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These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Cass County

Time zone	Local time and UTC offset	Next clock change
Central TimeAmerica/Chicago	UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.	Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

626187,428 people
626756,170 people
626912,349 people
626121,398 people
626111,047 people
626271,006 people
62673361 people
62622100 people

8 ZIP Code areas overlap Cass County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Cass County, largest first

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county

School districts in Cass County, largest first

Beardstown Community Unit School District 157,549 people
Porta Community Unit School District 2026,880 people
A-C Central Community Unit School District 2622,352 people
Virginia Community Unit School District 642,218 people
Triopia Community Unit School District 272,183 people
Meredosia-Chambersburg Community Unit School District 111,351 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

Beardstown, Illinois (city)6,169 people
Virginia, Illinois (city)1,543 people
Ashland, Illinois (village)999 people
Chandlerville, Illinois (village)534 people
Arenzville, Illinois (village)342 people

Bordering areas, nearest first

Distances are straight lines between map points.

Morgan County, Illinois18 mi south
Schuyler County, Illinois23 mi northwest
Menard County, Illinois24 mi east
Mason County, Illinois26 mi northeast
Brown County, Illinois27 mi west
Sangamon County, Illinois34 mi southeast

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Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.